The Springfield Armory Kuna is a roller-delayed blowback pistol chambered in .40 S&W, built as a large-format PDW-style platform rather than a traditional handgun. It has a 6.12-inch barrel and ships with a Strike Industries FSA pistol brace attached. The upper receiver is forged 7075-T6 aluminum mated to a glass-filled polymer lower, giving the gun a durable but lightweight build. 
 

Key Specifications 

• Brand: Springfield Armory 
• Model: Kuna 
• Caliber: .40 S&W 
• Action: Semi Auto 
• Capacity: 30 Rounds 
• Barrel Length: 6.12 inches 
• Color: Black 
• Material: 7075-T6 Aluminum Upper, Polymer Lower 
   

Detailed Features 

• Roller-delayed blowback action is meant to soften the felt recoil compared with a straight blowback design in this caliber. 
• The charging handle is non-reciprocating, and the safety selector, bolt release, and magazine release are all ambidextrous. 
• Hybrid flip-up sights fold down to a U-notch rear with a high-visibility front blade, or deploy into a protected aperture rear paired with an adjustable hooded front sight. 
• A multi-port muzzle brake is fitted to help control muzzle rise. 
• The FSA pistol brace comes installed from the factory for a more stable shoulder-braced hold.

Owners of large-format pistols like the Kuna tend to compare the roller-delayed system against a straight blowback gun in the same caliber, and most describe the recoil impulse as noticeably softer once the gun is broken in. A common complaint in this class is that reliability can be sensitive to ammunition choice early on, so some owners run a break-in period before trusting the gun for defensive use.

With the brace attached, shooters generally find the Kuna comfortable to shoulder for a steadier firing position, and left-handed owners in particular like having fully ambidextrous controls instead of fighting a right-side-only charging handle. Some describe the pistol as front-heavy compared to a standard handgun, which takes some adjustment for anyone used to carrying a conventional sidearm.

Buyers weighing the Kuna against other large-format pistols tend to like that it uses common mounting standards for the handguard and sights, which keeps accessory choices open. Opinions are mixed on whether the package is worth it against a comparable AR-pattern pistol caliber build, and a few owners wish more optics-mounting options came standard.